93e1c666-85e5-4f41-a84e-1cc981ef5bfc_source eng; USA utf8 dataset Simone Montayne Alaska Division of Geological & Geophysical Surveys Metadata Manager (907)451-5020 (907)451-5050 3354 College Road Fairbanks AK 99709-3707 USA dggspubs@alaska.gov 8 am to 4:30 pm, Monday through Friday, except State holidays pointOfContact 2025-01-22 ISO 19115 Geographic Information - Metadata ISO 19115:2003/Cor.1:2006(E) Landslide hazard susceptibility mapping in Haines, Alaska 2025-01-01 publication Alaska Division of Geological & Geophysical Surveys Fairbanks Alaska, United States publisher Nicolazzo, J.A. originator Larsen, M.C. originator https://doi.org/10.14509/31309 GEODATABASE, RASTER Report of Investigation RI 2024-8 16 p., 3 sheets, scale 1:25,000 Landslide hazard susceptibility mapping in Haines, Alaska, Report of Investigation 2024-8, provides a map and database of historical and prehistoric slope failures, maps of shallow and deep-seated landslide susceptibility, and a map of simulated debris flow runouts for the city and borough of Haines, Alaska. This work was prompted by the deadly Beach Road landslide that occurred on December 2, 2020, in Haines, Alaska, which highlights the significant safety and financial risks posed by slope failures to people and infrastructure. To better inform the Haines Borough of their potential landslide hazards and increase the city's hazard resiliency, the Alaska Division of Geological & Geophysical Surveys (DGGS) developed maps of historical and prehistorical slope failures, shallow landslide susceptibility, and modeled debris flow runouts. DGGS staff created a shallow landslide susceptibility map following protocols like those developed by the Oregon Department of Geology and Mineral Industries, which includes incorporating landslide inventory data, geotechnical soil properties, and lidar-derived topographic slope to calculate the Factor of Safety (FOS), which serves as a proxy for landslide susceptibility. Debris flow runout extents were generated using the model Laharz, which simulates runout extents based on catchment-specific physical parameters (e.g., hypothetical sediment volumes). Data from these analyses are collectively intended to depict locations where landslides are relatively more likely to occur or are relatively more likely to travel. The results provide important hazard information that can help guide planning and future risk investigations. The maps are not intended to predict slope failures and are site-specific; detailed investigations should be conducted before development in vulnerable areas. Results are for informational purposes and are not intended for legal, engineering, or surveying uses. These data and the interpretive maps and report are available from the DGGS website: http://doi.org/10.14509/31309. The deadly Beach Road landslide that occurred on December 2, 2020, in Haines, Alaska, highlights the significant safety and financial risks posed by slope failures to people and infrastructure. To better inform the Haines Borough of their potential landslide hazards and increase the city's hazard resiliency, the Alaska Division of Geological & Geophysical Surveys (DGGS) developed maps of historical and prehistorical slope failures, shallow landslide susceptibility, and modeled debris flow runouts. DGGS collected and processed lidar data and conducted landslide susceptibility mapping for this project using funds provided by the Federal Emergency Management Agency (FEMA) Cooperative Technical Partnership (CTP) Program grant number CTP EMS-2021-CA-00013-S01. We thank our reviewers Katreen Wikstrom Jones (DGGS) and Jacqueline Foss (U.S. Forest Service) for their thoughtful comments that helped improve the quality of this product. We also appreciate DOT&PF engineer Travis Eckhoff, P.E., for his local knowledge that helped verify our models, and Dr. Margaret Darrow (University of Alaska Fairbanks) for her insight into the Beach Road landslide. We also acknowledge Victoria Nelson for her countless hours spent performing soil laboratory testing and mapping landslide scarps in support of this project while working on her master's thesis. completed Alaska Division of Geological & Geophysical Surveys Metadata Manager (907)451-5020 (907)451-5050 3354 College Road Fairbanks AK 99709-3707 USA dggspubs@alaska.gov 8 am to 4:30 pm, Monday through Friday, except State holidays Please view our website (https://www.dggs.alaska.gov) for the latest information on available data. Please contact us using the e-mail address provided above when possible. pointOfContact notPlanned Coastal Coastal and River Colluvial Deposits Colluvium DGGS Debris Avalanche Debris Flow Debris Flow Deposit Drainage Patterns Emergency Preparedness Engineering Engineering Geology Environmental Geologic Geologic Hazards Geological Process Geology Geomorphology Geotechnical Hazards Landslide Landslide Deposit Landslide Susceptibility Modeling Rock Avalanche Rockfall Rocks Rotational Landslide Slides Slope Slope Instability Soils Surface Surface Water Surficial Surficial Geology Translational Landslide Transportation Corridor Unconsolidated Deposits theme Alaska Division of Geological & Geophysical Surveys Chilkat Peninsula Chilkat River Chilkat State Park Chilkoot Lake Ferebee River Haines Haines Borough Johnson Creek Lily Lake Mink Creek Mount Ripinski Mud Bay Nahku Portage Shakuseyi Creek Shiyi Bay Southeast Alaska Takhin River Yindastuki place Alaska Division of Geological & Geophysical Surveys Holocene temporal Walker, J.D., Geissman, J.W., Bowring, S.A, and Babcock, L.E., comp., 2012, Geologic Time Scale v. 4.0: Geological Society of America The State of Alaska makes no expressed or implied warranties (including warranties for merchantability and fitness) with respect to the character, functions, or capabilities of the electronic data or products or their appropriateness for any user's purposes. In no event will the State of Alaska be liable for any incidental, indirect, special, consequential, or other damages suffered by the user or any other person or entity whether from the use of the electronic services or products or any failure thereof or otherwise. In no event will the State of Alaska's liability to the Requestor or anyone else exceed the fee paid for the electronic service or product. otherRestrictions Use Constraints: Any hard copies or published datasets utilizing these datasets shall clearly indicate their source. If the user has modified the data in any way, the user is obligated to describe the types of modifications the user has made. The user specifically agrees not to misrepresent these datasets, nor to imply that changes made by the user were approved by the State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys. The State of Alaska makes no express or implied warranties (including warranties for merchantability and fitness) with respect to the character, functions, or capabilities of the electronic data or products or their appropriateness for any user's purposes. In no event will the State of Alaska be liable for any incidental, indirect, special, consequential, or other damages suffered by the user or any other person or entity whether from the use of the electronic services or products or any failure thereof or otherwise. In no event will the State of Alaska's liability to the Requestor or anyone else exceed the fee paid for the electronic service or product. otherRestrictions Access Constraints: This report, map, and/or dataset is available directly from the State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys (see contact information below). High-resolution lidar data for Haines, southcentral Alaska, December 8-12, 2020 2021-01-01 publication Alaska Division of Geological & Geophysical Surveys Fairbanks Alaska, United States publisher Daanen, R.P. originator Herbst, A.M. originator Wikstrom Jones, K.M. originator Wolken, G.J. originator https://doi.org/10.14509/30595 Raw Data File RDF 2021-4 8 p crossReference Rock strength properties of the Haines-Takshanuk Mountains-Chilkat Peninsula area STATEMAP project, Southeast Alaska 2024-01-01 publication Alaska Division of Geological & Geophysical Surveys Fairbanks Alaska, United States publisher Nicolazzo, J.A. originator Darrow, M.M. originator Larsen, M.C. originator Walser, S.L. originator https://doi.org/10.14509/31416 Raw Data File RDF 2024-28 4 p crossReference Soil index properties and radiocarbon ages of the Haines-Takshanuk Mountains-Chilkat Peninsula area STATEMAP project, Southeast Alaska 2024-01-01 publication Alaska Division of Geological & Geophysical Surveys Fairbanks Alaska, United States publisher Nicolazzo, J.A. originator Darrow, M.M. originator Walser, S.L. originator https://doi.org/10.14509/31415 Raw Data File RDF 2024-27 24 p crossReference Lidar interpretation in Haines, Alaska (poster): Haines Borough community meeting, September 4, 2024 2024-01-01 publication Alaska Division of Geological & Geophysical Surveys Fairbanks Alaska, United States publisher Nicolazzo, J.A. originator Larsen, M.C. originator https://doi.org/10.14509/31414 Poster and Presentation Nicolazzo, J.A. and Larsen, M.C., 2024 1 sheet crossReference Tsunami inundation maps for Skagway and Haines, Alaska 2018-01-01 publication Alaska Division of Geological & Geophysical Surveys Fairbanks Alaska, United States publisher Nicolsky, D.J. originator Suleimani, E.N. originator Salisbury, J.B. originator https://doi.org/10.14509/30029 Report of Investigation RI 2018-2 69 p., 3 sheets crossReference Field station locations and data for the geologic map of the Haines-Takshanuk Mountains-Chilkat Peninsula area STATEMAP project, southeast Alaska, collected in 2022 and 2023 2024-01-01 publication Alaska Division of Geological & Geophysical Surveys Fairbanks Alaska, United States publisher Truskowski, C.M. originator Walser, S.L. originator Larsen, M.C. originator Nicolazzo, J.A. originator Gillis, R.J. originator Bull, K.F. originator Regan, S.P. originator Darrow, M.M. originator Montayne, Simone originator https://doi.org/10.14509/31285 Raw Data File RDF 2024-17 3 p crossReference Photogrammetric data of the Haines Highway corridor: May 26, 2014 2017-01-01 publication Alaska Division of Geological & Geophysical Surveys Fairbanks Alaska, United States publisher Wolken, G.J. originator Wikstrom Jones, K.M. originator Whorton, E.N. originator Gould, A.I. originator Hendricks, M.D. originator https://doi.org/10.14509/29736 Raw Data File RDF 2017-6 20 p crossReference Lidar-derived elevation data for Haines, Southeast Alaska, collected October 2021 and October 2022 2024-01-01 publication Alaska Division of Geological & Geophysical Surveys Fairbanks Alaska, United States publisher Zechmann, J.M. originator Daanen, R.P. originator Wikstrom Jones, K.M. originator Wolken, G.J. originator https://doi.org/10.14509/31034 Raw Data File RDF 2023-18 16 p crossReference vector eng; USA geoscientificInformation -135.756590 -135.291554 59.083205 59.405233 1972-01-01 2024-01-01 >landslide-susceptibility: Landslide inventory geodatabase and accompanying data dictionary >shallow_landslide-susceptibility: Raster image depicting slopes susceptible to shallow landslides true geodatabase, raster unknown Alaska Division of Geological & Geophysical Surveys Metadata Manager (907)451-5020 (907)451-5050 3354 College Road Fairbanks AK 99709-3707 USA dggspubs@alaska.gov 8 am to 4:30 pm, Monday through Friday, except State holidays Please view our website (https://www.dggs.alaska.gov) for the latest information on available data. Please contact us using the e-mail address provided above when possible. distributor Contact DGGS for current pricing Free download https://doi.org/10.14509/31309 geodatabase, raster digital data information dataset Horizontal Positional Accuracy Report The positional accuracy of the slope failure inventory, factor of safety, debris flow runout models were developed using the best available data; however, there are inherent limitations to the calculated and interpreted feature extents. The accompanying report provides a complete discussion of specific limitations and potential sources of error. For most of the project area DGGS used lidar point cloud data to produce a high-resolution (1-3ft) digital terrain models (DTM). The DTM, also known as a bare-earth elevation model, was essential for identifying landslide geomorphology beneath dense vegetation, confirming evidence of landslide activity identified in aerial photograph sequences, making FOS calculations, and modeling potential debris flow runouts. For the area around Chilkoot Lake where lidar was not collected, we downloaded data from ArcticDEM. The ArcticDEM is a composite of numerous digital elevation models (DEMs) sourced from satellite imagery collected over several years. It has 2-m (about 6-ft) resolution and contains more elevation spikes, pits, and holes of missing data than our datasets; therefore, all results from the ArcticDEM dataset have lower confidence. This data release is complete. This data release is complete. Not applicable This lineage was generated by the FGDC CSDGM to 19139 transformation Lidar acquisition and processing - Two light detection and ranging (lidar) datasets were previously collected for other projects in the Haines area that overlap this project's AOI. Quantum Spatial collected one dataset in May 2014 (1-m [3-ft] resolution) that was centered primarily on the city of Haines. In December 2020, DGGS collected lidar as part of emergency operations following the landslide event. The collection covered areas over the city of Haines, south along Mud Bay Road, extents of existing lidar datasets displayed over Esri's World Terrain basemap of the area of interest. North along Lutak Road, and on the opposite side of Lutak Inlet with a 1-m (3-ft) resolution. Additionally, during 2021 and 2022, DGGS collected a new lidar dataset for this project, which covered a much larger area with a 50-cm (1.5 ft) resolution. This project used digital terrain models (DTMs) generated from each of these lidar datasets. For the area around Chilkoot Lake where lidar was not collected, we downloaded data from ArcticDEM. The ArcticDEM is a composite of numerous digital elevation models (DEMs) sourced from satellite imagery collected over several years. It has 2-m (6-ft) resolution and contains more elevation spikes, pits, and holes of missing data than our datasets; therefore, all results from the ArcticDEM dataset have lower confidence. 2023-01-01T00:00:00 Landslide inventory - The comprehensive landslide inventory was generated by collecting and organizing existing information about previously identified landslides, acquiring, processing, and analyzing high-resolution lidar elevation data, and compiling all landslide information into a geodatabase. 2023-01-01T00:00:00 Shallow landslide susceptibility - We developed a map showing slopes susceptible to shallow landslides. Shallow landslides occur in surficial soils, to a maximum depth of about 4.5 m (15 ft). This method combines areas of mapped shallow landslides with a calculated factor of safety (FOS). The result is a map that displays susceptibility as high, moderate, or low zones. Data were processed using methods described in the accompanying report. 2023-01-01T00:00:00 Channelized debris flow susceptibility - We used the methodology of Burns and others (2022) to map slopes that are susceptible to channelized debris flows which includes custom ArcGIS geoprocessing tools to simplify the process. This method models debris flow initiation potential, transport potential, and inundation (deposition) to produce a map that displays debris flow initiation and transport susceptibility in high, moderate, or low zones, and the inundation extent for each level of modeled event severity. The accompanying report provides details of the proceedure. 2023-01-01T00:00:00 otherRestrictions Metadata Use Constraints: If the user has modified the data in any way they are obligated to describe the types of modifications they have performed in the supporting metadata file. User specifically agrees not to imply that changes they made were approved by the Alaska Department of Natural Resources or Division of Geological & Geophysical Surveys. unknown This metadata was automatically generated from the FGDC Content Standard for Digital Geospatial Metadata standard (version FGDC-STD-001-1998) using the 2019-08-12T11:11:00 version of the FGDC CSDGM to ISO 19139 transform. Simone Montayne Alaska Division of Geological & Geophysical Surveys Metadata Manager (907)451-5020 (907)451-5050 3354 College Road Fairbanks AK 99709-3707 USA dggspubs@alaska.gov 8 am to 4:30 pm, Monday through Friday, except State holidays pointOfContact